build: Remove patch 0008-ensure-KV-cache-is-fully-defragmented.patch

KV caching and defragging have been completely overhauled since the last
bump, so this patch no longer has a logical home.

ggml-org/llama.cpp#13746

Branch: GraniteFour

Signed-off-by: Gabe Goodhart <ghart@us.ibm.com>

Author: gabe-l-hart